Laplace transform unit step function

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The Laplace transform of a function that is 1 from 0 to 10 and 0 elsewhere can be expressed using the unit step function as f(t) = u(t) - u(t-10). To find the Laplace transform, one can utilize the definition of the Laplace transform and the properties of the unit step function. It is suggested to represent such functions as differences rather than products for easier computation. Knowing the Laplace transform of the unit step function simplifies the process significantly. The discussion emphasizes the utility of the unit step function in defining piecewise functions for Laplace transforms.
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What is the laplace transform of a function that is 1 from 0 to 10 and 0 elsewhere?

I know that this can be represented by the step function U(10-t)U(t)...but how do i find the laplace transform of this?
 
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I would try starting with the definition of the Laplace function. I assume you know it.
 
Also, you might find it more convenient to represent such functions as differences instead of products. For example, if f(t) = 1 on (a,b) and 0 elsewhere you can write it

f(t) = u(t-a) - u(t-b)

Then if you know L(u(t-t0)) it becomes very easy.
 
Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

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